Linear polarization measurement of interband transitions in superdeformed Hg-190: Model-independent evidence for octupole vibrational structures

A Korichi, A N Wilson, F Hannachi, A Lopez-Martens, M Rejmund, C Schuck, C Vieu, G Chmel, A Gorgen, H Hubel, D Rossbach, S Schonwasser, M Bergstrom, B M Nyako, J Timar, D Bazzacco, S Lunardi, C Rossi-Alvarez, P Bednarczyk, N KintzS Naguleswaran, A Astier, D M Cullen, J F Sharpey-Schafer, T Lauritsen, R Wadsworth

Research output: Contribution to journalArticlepeer-review

Abstract

The linear polarization of gamma rays between excited and yrast superdeformed (SD) states in Hg-190 was measured using the four-element CLOVER detectors of the EUROBALL IV gamma -ray spectrometer. This measurement shows in a model-independent way that the interband transitions which compete with the highly collective in-band quadrupole transitions are largely enhanced electric dipoles. Not only do these results represent the first measurement of the multipolarity of transitions between different SD states, but they also provide strong evidence for the interpretation of the structures in the SD minimum of the A similar to 190 region in terms of octupole excitations.

Original languageEnglish
Pages (from-to)2746-2749
Number of pages4
JournalPhysical Review Letters
Volume86
Issue number13
Publication statusPublished - 26 Mar 2001

Keywords

  • QUASI-PARTICLE EXCITATIONS
  • COMPTON POLARIMETER
  • BANDS
  • NUCLEI
  • ENERGIES
  • STATES
  • PARITY
  • DECAY
  • SPINS

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